RAID Link Blast

scottalanmiller

I had a quote for a new ERP system last week and in the vendor proposal under recommendations for SQL server they've written "at least 300Gb of disk space in RAID 5". I was bit WTF, haven't we moved on from specifying RAID levels?

Especially from specifying the worst possible RAID level. Even in the 1990s RAID 5 was a "compromise" level. It should never be specified as a requirement, only possibly a minimum. In this case, the wording is confusing. Maybe they meant RAID 5 (or better) which is okay potentially. But requiring RAID 5 period, is bad. All depends on how they meant it to read.

scottalanmiller

Added a new reference on RAID Write Penalties today.
http://theithollow.com/2012/03/understanding-raid-penalty/

JaredBusch

@scottalanmiller said:

Added a new reference on RAID Write Penalties today.
http://theithollow.com/2012/03/understanding-raid-penalty/

Thanks for that. I will use that tomorrow in fact.

scottalanmiller

Added Practical RAID Performance to the list.

scottalanmiller

Added "Practical RAID Decision Making"

scottalanmiller

Updating this thread with this new mini-article:

http://mangolassi.it/topic/5637/growing-a-raid-array-what-you-need-to-know

scottalanmiller

Added this one:

http://mangolassi.it/topic/5895/understanding-raid-5-with-ssd-solid-state-drives

scottalanmiller

And this one..

http://mangolassi.it/topic/5893/why-we-do-not-preemptively-replace-hard-drives

scottalanmiller

Added this reference for the NetApp RAID-DP System to the list: http://www.netapp.com/us/media/tr-3298.pdf

scottalanmiller

And: https://www.kernel.org/pub/linux/kernel/people/hpa/raid6.pdf

scottalanmiller

Two new ZDNet Robin Harris sources added today including: http://www.zdnet.com/article/has-raid5-stopped-working

Dashrender

@scottalanmiller said:

Two new ZDNet Robin Harris sources added today including: http://www.zdnet.com/article/has-raid5-stopped-working

Geezz.. could that be any more muddled?

scottalanmiller

@Dashrender said:

@scottalanmiller said:

Two new ZDNet Robin Harris sources added today including: http://www.zdnet.com/article/has-raid5-stopped-working

Geezz.. could that be any more muddled?

All the muddling was sarcasm. He's pointing out just how dramatically it stopped working.

Dashrender

@scottalanmiller said:

@Dashrender said:

@scottalanmiller said:

Two new ZDNet Robin Harris sources added today including: http://www.zdnet.com/article/has-raid5-stopped-working

Geezz.. could that be any more muddled?

All the muddling was sarcasm. He's pointing out just how dramatically it stopped working.

But then he goes on to say that he still uses it, sure he mentions that you need to have two copies of the data, but that just muddies the water and stupid people will use the article to allow them to continue to use it in ways the author doesn't intend - like production in an office.

scottalanmiller

@Dashrender said:

@scottalanmiller said:

@Dashrender said:

@scottalanmiller said:

Two new ZDNet Robin Harris sources added today including: http://www.zdnet.com/article/has-raid5-stopped-working

Geezz.. could that be any more muddled?

All the muddling was sarcasm. He's pointing out just how dramatically it stopped working.

But then he goes on to say that he still uses it, sure he mentions that you need to have two copies of the data, but that just muddies the water and stupid people will use the article to allow them to continue to use it in ways the author doesn't intend - like production in an office.